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