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