\documentclass[tikz]{standalone}
\usepackage{tikz}                       % images

\definecolor{evol}{RGB}{71,221,75}
\definecolor{sear}{RGB}{128,228,70}
\definecolor{extr}{RGB}{195,235,70}
\definecolor{stor}{RGB}{241,215,70}
\definecolor{auth}{RGB}{247,150,70}
\definecolor{link}{RGB}{75,172,198}
\definecolor{clas}{RGB}{73,206,182}
\definecolor{qlty}{RGB}{72,214,132}

\begin{document}
\newcommand{\D}{8} % number of dimensions (config option)

\newdimen\R % maximal diagram radius (config option)
\R=4.5cm 

\newcommand{\A}{-360/\D} % calculated angle between dimension axes  

% add the following two lines to your document to get bigger arrows
\usetikzlibrary{arrows.meta}
\tikzset{>={Latex[width=3mm,length=3mm]}}

\tikzstyle{circ}=[draw, anchor=center, shape=circle, text width=2.2cm]

\begin{tikzpicture}[scale=1,
  every label/.style={align=center}
%every label/.style={draw, align=center}
]

  % define labels for each dimension axis (names config option)
\path (1*\A:\R) node[circ, fill=evol, label=center:{Evolution/\\Repair}] (L1) {};             % green
\path (2*\A:\R) node[circ, fill=sear, label=center:{Search/\\Browsing/\\Exploration}] (L2) {}; % lime
\path (3*\A:\R) node[circ, fill=extr, label=center:{Extraction}] (L3) {};                      % lime
\path (4*\A:\R) node[circ, fill=stor, label=center:{Storage/\\Querying}] (L4) {};            % yellow
\path (5*\A:\R) node[circ, fill=auth, label=center:{Manual\\revision/\\Authoring}] (L5) {};  % orange
\path (6*\A:\R) node[circ, fill=link, label=center:{Interlinking\\/Fusing}] (L6) {};           % teal
\path (7*\A:\R) node[circ, fill=clas, label=center:{Classifi-\\cation/\\Enrichment}] (L7) {};  % teal
\path (8*\A:\R) node[circ, fill=qlty, label=center:{Quality\\Analysis}] (L8) {};               % green
  

  \draw [->, bend left=10] (L1) to (L2);
  \draw [->, bend left=10] (L2) to (L3);
  \draw [->, bend left=10] (L3) to (L4);
  \draw [->, bend left=10] (L4) to (L5);
  \draw [->, bend left=10] (L5) to (L6);
  \draw [->, bend left=10] (L6) to (L7);
  \draw [->, bend left=10] (L7) to (L8);
  \draw [->, bend left=10] (L8) to (L1);

\end{tikzpicture}
\end{document}
