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