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