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