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