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