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