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