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