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