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