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