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