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