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