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