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