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