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)(13,14,18,24)(15,25,27,20)(16,23,26,21)(17,28,19,22)(5,7,10,6)(8,12,9,11)(13,15)(14,20)(16,19)(17,26)(18,27)(21,22)(23,28)(24,25)(2,4)(13,16,17,27,18,26,19,15)(14,21,28,25,24,23,22,20)(5,8,10,9)(6,11,7,12)(13,17,18,19)(14,22,24,28)(15,26,27,16)(20,21,25,23)(5,9,10,8)(6,11,7,12)(13,16,19,15,18,26,17,27)(14,23,22,25,24,21,28,20)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.