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