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