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)(11,16)(12,15)(13,14)(17,18)(19,20)(21,23)(22,24) involution — undirected(2,5)(6,7)(9,11,12,13)(10,14,15,16)(17,19,22,23)(18,20,24,21)(10,14)(11,13)(15,16)(18,19)(20,21)(23,24) involution — undirected(1,3,4,8)(2,6,5,7)(9,11,12,13)(10,14,15,16)(17,20,22,21)(18,19,24,23)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.