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