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