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