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