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