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