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