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