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