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