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