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)(17,18,21,20,22,24,29,28)(19,23,27,25,26,30,32,31)(3,8)(5,7)(9,10)(11,16)(12,15)(13,14) involution — undirected(1,3,4,8)(2,5,6,7)(9,11,13,12)(10,15,14,16)(17,19)(18,23)(20,25)(21,27)(22,26)(24,30)(28,31)(29,32)(2,6)(5,7)(9,11,13,12)(10,15,14,16)(17,20,21,24,22,28,29,18)(19,25,27,30,26,31,32,23)(9,12,13,11)(10,15,14,16)(18,24)(19,26)(20,28)(27,32)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.