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