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