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