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