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