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