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