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