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