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