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