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