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