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