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