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