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