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