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