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