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)(11,13)(12,14)(15,16)(17,18,21,23)(19,26,27,32)(20,25,22,30)(24,29,31,28)(1,3)(2,5)(4,8)(6,7)(9,11)(10,13)(12,15)(14,16)(18,23)(19,27)(25,30)(28,29) involution — undirected(10,14)(11,15)(17,19,20,29,21,27,22,28)(18,24,30,32,23,31,25,26)(2,6)(5,7)(18,23)(19,27)(25,30)(28,29) involution — undirected(3,8)(5,7)(11,15)(13,16)(17,20,21,22)(18,25,23,30)(19,28,27,29)(24,32,31,26)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.