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