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