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