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