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