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