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