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