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