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