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