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