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)(11,12)(13,17)(14,18)(15,24)(16,19)(20,22)(21,23) involution — undirected(9,11,15,17,16,21,14,20)(10,13,18,12,19,22,24,23)(2,5)(6,8)(9,12,16,23)(10,11,19,21)(13,14,22,15)(17,18,20,24)(9,13)(10,17)(11,18)(12,14)(15,23)(16,22)(19,20)(21,24) involution — undirected(1,3,4,7)(2,6,5,8)(9,14,16,15)(10,18,19,24)(11,20,21,17)(12,22,23,13)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.