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