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