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