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