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