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