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