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