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)(17,18)(19,22)(20,30)(21,26)(23,32)(24,27)(25,28)(29,31) involution — undirected(1,3)(2,7)(4,14)(5,13)(6,12)(8,15)(9,11)(10,16)(18,22)(19,27)(20,28)(23,30)(24,25)(26,31)(29,32) involution — undirected(2,8)(4,5)(7,15)(9,10)(11,16)(13,14) involution — undirected(3,12)(7,16)(11,15)(13,14)(17,19,28,32,21,29,20,27)(18,23,30,22,26,24,25,31)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.