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