\begin{tikzpicture}[ scale=1.5, dot/.style={circle,fill=black,inner sep=2pt}, center/.style={circle,fill=red,inner sep=3pt}, arrow/.style={thick,->,>=stealth} ] \node[dot,label=below left:\(\xi_3\)] at (0,0){ }; \node[dot,label=below:\(\xi_4\)] at (1,0){ }; \node[dot,label=below right:\(\xi_5\)] at (2,0){ }; \node[dot,label=left:\(\xi_2\)] at (0,1){ }; \node[center] at (1,1){ }; \node[dot,label=right:\(\xi_6\)] at (2,1){ }; \node[dot,label=above left:\(\xi_1\)] at (0,2){ }; \node[dot,label=above:\(\xi_8\)] at (1,2){ }; \node[dot,label=above right:\(\xi_7\)] at (2,2){ }; \draw[arrow] (1.0,1.2) -- (1.0,1.8); \draw[arrow] (1.2,1.0) -- (1.8,1.0); \draw[arrow] (1.0,0.8) -- (1.0,0.2); \draw[arrow] (0.8,1.0) -- (0.2,1.0); \draw[arrow] (1.2,1.2) -- (1.8,1.8); \draw[arrow] (1.2,0.8) -- (1.8,0.2); \draw[arrow] (0.8,0.8) -- (0.2,0.2); \draw[arrow] (0.8,1.2) -- (0.2,1.8); \end{tikzpicture}