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