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