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)(15,22)(16,19)(17,21)(18,26)(20,24)(23,28)(25,27)(6,9)(7,11)(13,15,18,24,19,23,17,27)(14,20,21,22,16,25,26,28)(2,4)(5,6)(7,10)(8,9)(11,12)(13,16,19,14)(15,20,23,25)(17,21,18,26)(22,27,28,24)(6,9)(10,12)(13,17)(14,21)(16,26)(18,19)(20,25)(24,27) involution — undirected(5,7,8,11)(6,10,9,12)(14,16)(15,23)(21,26)(24,27)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.