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