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