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