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