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