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