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