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