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