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