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