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