Minimal Cayley graphs
A Cayley graph is a graph that encodes the abstract structure of a group. An undirected graph G is a minimal Cayley graph if there is a group Γ with an inclusion-minimal inverse-closed generating set C such that the Cayley graph Cay(Γ,C) is isomorphic to G. The following collection was calculated by the House of Graphs (source) and lists all minimal Cayley graphs on up to 95 vertices.