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