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