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