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