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)(18,21)(19,24)(20,23)(25,26)(27,31)(28,32)(29,30) involution — undirected(1,3,5,12,6,13,4,11)(2,7,8,10,9,15,14,16)(17,18,23,26,22,25,20,21)(19,24,30,32,27,31,28,29)(17,19,22,27)(18,24,25,31)(20,28,23,30)(21,29,26,32)(1,4,6,5)(2,8,9,14)(3,11,13,12)(7,10,15,16)(19,27)(24,31)(28,30)(29,32)A 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.