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