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