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