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