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