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