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