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