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