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