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