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