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