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