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