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