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