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