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