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