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