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