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