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