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