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