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