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