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