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