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