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