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