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