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