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