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