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