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