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