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