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