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