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