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