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