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