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