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