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