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