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