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