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