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