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