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