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