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