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