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