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