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