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