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