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