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