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