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