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