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