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