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