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