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