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)(20,24,29,30)(21,25)(22,27,31,28)(26,32)(1,3)(2,6)(4,10)(5,9)(7,12)(8,13)(11,15)(14,16)(17,19)(18,22)(20,28)(21,26)(23,30)(24,32)(25,31)(27,29) involution — undirected(3,9)(6,12)(10,15)(13,16)(17,19)(18,23)(20,27)(21,26)(22,30)(24,31)(25,32)(28,29) involution — undirected(2,7)(6,12)(8,14)(13,16)(19,26)(22,31)(23,32)(27,28) 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.