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)(15,24,17,28)(16,26,22,20)(18,27,25,23)(1,2)(3,4)(5,7,9,6)(8,10,12,11)(13,15,25,26,19,17,18,20)(14,16,27,28,21,22,23,24)(5,8,9,12)(6,10,7,11)(13,16,19,22)(14,20,21,26)(15,23,17,27)(18,24,25,28)(2,4)(6,7)(10,11)(14,21)(16,22)(23,27)(24,28) involution — undirected(13,17,18,26,19,15,25,20)(14,22,23,28,21,16,27,24)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.