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