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