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