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