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