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