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)(17,21,20,26)(18,28,25,22)(1,2)(3,4)(6,9)(10,12)(13,15,25,21,19,16,18,26)(14,17,28,27,23,20,22,24)(2,4)(5,7,8,11)(6,10,9,12)(13,16,18,21,19,15,25,26)(14,20,22,27,23,17,28,24)(1,2)(3,4)(13,17)(14,21)(15,22)(16,28)(18,24)(19,20)(23,26)(25,27) involution — undirected(2,4)(15,16)(17,20)(21,26)(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.