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