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