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