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)(19,26)(25,31)(27,30)(29,32)(1,3,5,4)(2,6,7,8)(9,11)(10,13)(12,16)(14,15)(18,22)(19,27)(20,23)(24,28)(25,31)(26,30)(1,4,5,3)(2,6,7,8)(10,14)(11,16)(17,18,23,28,21,24,20,22)(19,25,30,32,26,31,27,29)(10,14)(13,15)(18,24)(22,28)(25,31)(29,32) involution — undirected(17,19,20,27,21,26,23,30)(18,25,22,29,24,31,28,32)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.