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