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