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