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