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