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)(13,19,21,16)(14,22)(15,18)(17,23)(20,24,26,25)(3,4)(5,8)(6,10)(7,9)(11,13)(12,16)(14,20)(15,21)(17,24)(18,19)(22,25)(23,26) involution — undirected(3,5,7,6)(4,8,9,10)(11,14,15,23)(12,17,18,22)(13,20,21,26)(16,24,19,25)(14,23)(17,22)(20,26)(24,25) involution — undirectedA 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.