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