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