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