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