One vertex per element, one color per generator, with an edge from x to x·s.
(1,2) involution — undirected(4,8)(5,6)(9,10)(11,12)(13,23)(14,26)(15,20)(16,21)(17,22)(18,24)(19,25) involution — undirected(3,4)(5,8)(6,10)(7,9)(11,13)(12,18)(14,15)(16,24)(17,25)(19,21)(20,23)(22,26) involution — undirected(3,5,7,6)(4,8,9,10)(11,14,17,24)(12,19,22,23)(13,15,25,16)(18,21,26,20)(11,15,17,16)(12,20,22,21)(13,14,25,24)(18,23,26,19)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.