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