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