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