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