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