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