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