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