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