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