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)(11,15)(12,16)(13,14)(19,27)(20,21)(23,30)(24,25)(28,29)(31,32) involution — undirected(2,6)(7,8)(10,14)(11,12)(17,18,22,26)(19,23,28,32)(20,24,21,25)(27,30,29,31)(1,3,5,4)(2,7,6,8)(9,11,13,12)(10,15,14,16)(17,19,22,28)(18,23,26,32)(20,27,21,29)(24,30,25,31)(1,4,5,3)(2,8,6,7)(11,12)(15,16)(17,20,22,21)(18,24,26,25)(19,27,28,29)(23,30,32,31)(9,12,13,11)(10,16,14,15)(17,20,22,21)(18,25,26,24)(19,27,28,29)(23,31,32,30)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.