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)(15,16)(17,19)(18,20)(21,22)(23,26)(24,25)(27,28)(5,7,9,12)(6,10,11,8)(13,15,17,20)(14,18,19,16)(22,25)(26,28)(1,3,4,2)(6,11)(7,12)(14,19)(16,18)(21,23,24,27)(22,26,25,28)(5,7)(6,10)(8,11)(9,12)(13,16,17,18)(14,15,19,20)(21,23)(22,26)(24,27)(25,28)(5,8,9,10)(6,7,11,12)(13,15)(14,18)(16,19)(17,20)(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.