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