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