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