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