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