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