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