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