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