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