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