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