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