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