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