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