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