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