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