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