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