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