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