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