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