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