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