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