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)(11,15)(12,14)(13,16)(17,18,20,22)(19,23,24,21)(25,26,31,29)(27,32,30,28)(1,3)(2,4)(5,8)(6,7)(9,11,14,13)(10,15,12,16)(19,24)(21,23)(25,27,31,30)(26,32,29,28)(2,5)(3,7)(9,10,14,12)(11,16,13,15)(17,18)(19,21)(20,22)(23,24)(25,28)(26,30)(27,29)(31,32)(1,4,6,8)(2,7,5,3)(9,12,14,10)(11,15,13,16)(17,19)(18,21)(20,24)(22,23)(25,29,31,26)(27,32,30,28)(1,5,6,2)(3,8,7,4)(9,13,14,11)(10,15,12,16)(17,18)(19,21)(20,22)(23,24)(25,30,31,27)(26,32,29,28)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.