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