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