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