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