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