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