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