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