\documentclass{standalone}
\usepackage{tikz-feynman}

\begin{document}
	\footnotesize
\begin{tikzpicture}
	\begin{feynman}
		\vertex (u1) {$u$};
		\vertex  (s1) {$s$};
		\vertex at ($(u1)+(2,-3)$) (g11);
		\vertex at ($(s1)+(2,-3)$) (g12);
		\vertex  (g21);
		\vertex  (g22);
		\vertex at ($(g21)+(2,3)$) (u2) {$u$};
		\vertex at ($(g22)+(2,3)$) (s2) {$s$};
		\vertex at ($(g12)+(.5,-2)$) (s3) {$s$};
		\vertex at ($(g22)-(.5,2)$) (s4) {$s$};
		
		\diagram  {
			(u1) --  (g11) --  (g21) --  (u2),
			(g11) --  (g12), 	(g21) --  (g22),
			(s3) --  (g12) --  (s1),
			(s2) --  (g22) --  (s4),
		};
		
		\draw  (u1.north west) -- node  {$\kappa^-$} (s1.south west);
		\draw  (u2.north east) -- node  {$\kappa^+$} (s2.south east);
		\draw  (s3.south west) -- node  {$\phi$} (s4.south east);
		
		\node  at (g11) {};
		\node  at (g12) {};
		\node  at (g21) {};
		\node  at (g22) {};

	\end{feynman}
\end{tikzpicture}
\end{document}