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