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