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