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