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