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