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