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