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