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