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