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