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