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