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