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