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