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