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