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