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