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