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