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