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