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