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