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