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