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