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