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