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