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