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