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