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