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