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