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