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