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