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