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