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