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)(11,14)(12,15)(13,16)(17,18,21,23)(19,20,24,22)(26,29)(27,31)(2,5)(6,7)(9,11)(10,13)(12,16)(14,15)(17,19,21,24)(18,22,23,20)(26,29)(30,32)(3,8)(6,7)(11,16)(13,14)(18,23)(19,24)(25,26)(27,30)(28,29)(31,32) involution — undirected(1,3)(2,6)(4,8)(5,7)(9,11)(10,14)(12,16)(13,15)(17,19)(18,22)(20,23)(21,24)(25,26)(27,30)(28,29)(31,32) involution — undirected(1,2)(3,6)(4,5)(7,8)(9,10)(11,14)(12,15)(13,16)(17,20,21,22)(18,19,23,24)(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.