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)(11,15)(12,16)(17,18)(19,26)(20,30)(21,24)(22,25)(23,27)(28,31)(29,32) involution — undirected(1,2)(3,7)(4,8)(5,14)(6,9)(10,11)(12,15)(13,16)(17,19)(18,23)(20,29)(21,27)(22,28)(24,31)(25,32)(26,30) involution — undirected(1,3)(2,7)(4,13)(5,11)(6,12)(8,16)(9,15)(10,14)(19,27)(20,21)(23,31)(24,30)(26,32)(28,29) involution — undirected(1,4,6,5)(2,8,9,14)(3,11,12,13)(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.