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