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