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