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