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