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