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