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