# Are there any vertex-transitive graphs which are not generalized Cayley graphs?

Generalized Cayley graphs were introduced by Marusic etal in 1992. Ademir Hujdurovic etal proved that there are infinitely many vertex-transitive generalized Cayley graphs which are not Cayley graphs. In fact, line graph of Petersen graph is one such example. They also prove that generalized Cayley graphs admits semi-regular automorphism.

It is obvious generalized Cayley graph $$GC(G,S,\alpha)$$ is $$|S|$$-regular. Moreover, there are examples of non-vertex-transitive generalized Cayley graphs.

My question is: Does there exist any vertex-transitive graph which is not generalized Cayley?

One answer to this is Petersen graph. For if it is generalized Cayley graph of order $$10$$ ($$=2p$$), it must be Cayley.

I am looking for some more such examples?