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