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