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