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