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