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