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