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