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