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