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