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