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