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