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