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