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