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