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