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