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