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