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