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