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