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