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