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