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