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