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