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