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