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