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