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