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