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