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