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