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