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