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