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