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