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