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