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