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