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