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