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