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