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