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