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