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