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