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