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)(11,14)(12,13)(15,16)(17,18,24,30)(19,25,20,26)(21,27,23,29)(22,28,31,32)(1,3,4,8)(2,5,6,7)(17,19,24,20)(18,25,30,26)(21,22,23,31)(27,28,29,32)(10,13)(14,16)(17,20,23,31,24,19,21,22)(18,26,29,32,30,25,27,28)(2,6)(5,7)(17,21,24,23)(18,27,30,29)(19,22,20,31)(25,28,26,32)(3,8)(5,7)(9,11,12,15)(10,14,13,16)(17,22,23,20,24,31,21,19)(18,28,29,26,30,32,27,25)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.