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