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