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