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