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