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