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