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