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