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)(15,21,26,22)(16,27,17,28)(18,23,19,24)(1,2)(3,4)(6,10)(11,12)(13,15,20,26)(14,21,25,22)(16,18,17,19)(23,28,24,27)(5,7,9,8)(6,11,10,12)(13,16,19,15,20,17,18,26)(14,22,23,28,25,21,24,27)(2,4)(5,8,9,7)(6,12,10,11)(13,17,19,26,20,16,18,15)(14,21,23,27,25,22,24,28)(6,10)(11,12)(13,18,20,19)(14,23,25,24)(15,17,26,16)(21,28,22,27)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.