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