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