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