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