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