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