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)(15,23)(17,24)(20,25)(21,27)(22,28)(6,9)(7,11)(13,14,17,19,18,22,24,28)(15,21,16,25,23,20,26,27)(2,4)(5,6)(7,10)(8,9)(11,12)(13,15)(14,20)(16,17)(18,23)(19,27)(21,22)(24,26)(25,28) involution — undirected(6,9)(10,12)(13,16,18,26)(14,21,22,20)(15,24,23,17)(19,27,28,25)(5,7,8,11)(6,10,9,12)(14,22)(19,28)(20,21)(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.