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