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