\begin{tikzpicture}
	\begin{pgfonlayer}{nodelayer}
		\node [style=red node] (0) at (0, 1) {};
		\node [style=blue node 2] (1) at (1, 0) {};
		\node [style=blue node] (2) at (-1, 0) {};
		\node [style=yellow square] (3) at (0, -1) {foo};
	\end{pgfonlayer}
	\begin{pgfonlayer}{edgelayer}
		\draw [in=-90, out=0] (3.center) to (1.center);
		\draw [bend right=45, looseness=1.25] (3.center) to (2.center);
		\draw (2.center) to (0.center);
		\draw (0.center) to (1.center);
	\end{pgfonlayer}
\end{tikzpicture}