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