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