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