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