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