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