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