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