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