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