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