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