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