One vertex per element, one color per generator, with an edge from x to x·s.
(1,2) involution — undirected(4,6)(7,8)(9,10)(11,12)(13,20)(14,19)(15,17)(16,23)(18,21)(22,26)(24,25) involution — undirected(3,4,5,6)(12,17)(18,25)(19,23)(20,26)(11,13)(12,18)(14,21)(15,22)(16,24)(17,25)(19,26)(20,23) involution — undirected(8,10)(11,14,15,16)(12,19,17,23)(13,21,22,24)(18,26,25,20)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.