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