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