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