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