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