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