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