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