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