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