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)(19,26)(20,24)(21,23)(22,25)(27,30)(28,29)(31,32)(9,11)(10,13)(12,16)(14,15)(18,23)(19,27)(20,30)(22,28)(24,32)(26,31) involution — undirected(2,6)(7,8)(11,16)(13,15)(17,19,28,32,21,24,22,27)(18,20,29,30,23,26,25,31)(1,3,5,4)(2,7,6,8)(10,14)(13,15)(18,23)(20,26)(25,29)(30,31)(1,4,5,3)(2,8,6,7)(17,20,22,31,21,26,28,30)(18,24,25,32,23,19,29,27)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.