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