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