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)(11,15)(12,16)(13,14)(18,22)(20,23)(27,31)(30,32) involution — undirected(2,6)(4,7)(10,13)(11,12)(17,18,21,22)(19,20,24,23)(26,29)(30,32)(2,6)(4,7)(9,11,14,12)(10,15,13,16)(17,19,21,24)(18,23,22,20)(25,26)(27,30)(28,29)(31,32)(1,3,5,8)(2,7,6,4)(9,12,14,11)(10,16,13,15)(17,18)(19,23)(20,24)(21,22)(25,27)(26,30)(28,31)(29,32)(1,4,5,7)(2,3,6,8)(9,13,14,10)(11,15,12,16)(17,20,21,23)(18,19,22,24)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.