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