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