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