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