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