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