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