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