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