\documentclass[border=1pt]{standalone}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{fourier}
\usepackage{tikz}
\usetikzlibrary{arrows.meta}

\begin{document}

\begin{tikzpicture}[
    node distance=2cm and 2cm,
    every node/.style={circle, draw, minimum size=1cm},
    ->, >=Stealth
]
% Wierzchołki
\node (c1) at (0,0) {$c_1$};
\node (c2) at (2,2) {$c_2$};
\node (c3) at (4,2) {$c_3$};
\node (c4) at (4,0) {$c_4$};
\node (c5) at (2,0.5) {$c_5$};
\node (c6) at (2,-1.5) {$c_6$};
\node (c7) at (-1,-1.5) {$c_7$};

% Krawędzie
\draw (c1) -- (c2);
\draw (c2) -- (c3);
\draw (c3) -- (c4);
\draw (c4) -- (c5);
\draw (c5) -- (c2);
\draw (c5) -- (c1);
\draw (c5) -- (c6);
\draw (c6) -- (c4);
\draw (c6) -- (c7);
\draw (c7) -- (c1);

% Dodatkowe łuki
\draw (c2) to[bend right=30] (c1);
\draw (c1) to[bend right=40] (c7);
\end{tikzpicture}

\end{document}
