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