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