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)(19,20,22,23)(21,25,26,24)(4,8)(6,9)(12,16)(14,17)(20,23)(24,25) involution — undirected(11,12)(13,17)(14,18)(15,16)(19,20)(21,24)(22,23)(25,26) involution — undirected(3,5)(4,9)(6,8)(7,10)(11,13,15,18)(12,17,16,14)(19,21)(20,24)(22,26)(23,25)(3,6,7,9)(4,5,8,10)(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.