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