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