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