One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,4)(3,7,8,6)(9,10,12,14)(11,13,15,16)(25,26,29,27)(28,31,32,30)(1,3)(2,6)(4,7)(5,8)(11,15)(13,16)(17,18,20,22)(19,21,23,24)(9,10)(11,13)(12,14)(15,16)(17,18)(19,21)(20,22)(23,24)(25,27,29,26)(28,31,32,30)(1,3)(2,7)(4,6)(5,8)(9,11)(10,13)(12,15)(14,16)(25,28)(26,30)(27,31)(29,32) involution — undirected(1,4,5,2)(3,7,8,6)(9,10)(11,13)(12,14)(15,16)(17,19,20,23)(18,21,22,24)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.