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