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