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