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