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