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