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