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