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