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