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)(11,14)(12,13)(15,16)(17,18,21,25,22,19,26,24)(20,23,29,31,28,27,32,30)(1,3,4,8)(2,5,6,7)(10,13)(11,15)(20,28)(23,27)(29,32)(30,31)(9,11,12,15)(10,14,13,16)(17,19)(18,22)(20,27)(21,24)(23,28)(25,26)(29,30)(31,32)(2,6)(5,7)(10,13)(14,16)(17,20,21,29,22,28,26,32)(18,23,25,31,19,27,24,30)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.