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