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