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