One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,5)(6,8)(9,10)(11,13)(12,14)(15,16)(17,18)(19,24)(20,29)(21,25)(22,30)(23,26)(27,31)(28,32) involution — undirected(2,5)(6,7)(9,11,12,16)(10,13,14,15)(17,19,23,28)(18,24,26,32)(20,21,27,22)(25,31,30,29)(9,10)(11,15,16,13)(12,14)(17,20,22,19,23,27,21,28)(18,24,25,29,26,32,30,31)(1,3,4,8)(2,6,5,7)(17,21,23,22)(18,25,26,30)(19,27,28,20)(24,31,32,29)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.