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