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