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