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