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