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