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