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