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