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