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