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