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