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