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