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