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