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