\documentclass{standalone}
\usepackage{tikz-network}
\begin{document}
	\begin{tikzpicture}
		\clip (0,0) rectangle (6,6);
		\Vertex[x=0.785,y=2.375,color=red,opacity=0.5,label=Alice]{a}
		\Vertex[x=5.215,y=5.650,color=blue,opacity=0.5,label=Bob]{b}
		\Vertex[x=3.819,y=0.350,color=red,opacity=0.5,label=Claire]{c}
		\Vertex[x=4.654,y=2.051,color=blue,opacity=0.5,label=Dennis]{d}
		\Edge[,bend=-8.531](a)(c)
		\Edge[,bend=-8.531](c)(d)
		\Edge[,bend=-8.531](d)(b)
		\Edge[,bend=-8.531](a)(b)
	\end{tikzpicture}
\end{document}