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