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