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