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