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