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