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