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)(19,27)(20,23)(21,31)(22,30)(24,29)(25,32)(26,28) involution — undirected(1,2)(3,5)(4,6)(7,8)(9,10)(11,16)(12,14)(13,15)(17,19,22,29,23,21,28,32)(18,24,26,27,20,25,30,31)(1,3,4,7)(2,5,6,8)(9,11,13,12)(10,14,15,16)(17,20,23,18)(19,24,21,25)(22,30,28,26)(27,32,31,29)(2,6)(5,8)(9,11,13,12)(10,14,15,16)(18,20)(24,25)(26,30)(27,31)(9,12,13,11)(10,14,15,16)(17,21,22,32,23,19,28,29)(18,25,26,31,20,24,30,27)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.