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