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