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