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