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