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