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