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