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