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)(15,23,26,28)(16,27,17,20)(18,25,24,21)(5,7)(6,9)(8,12)(10,11)(13,15,24,20,19,26,18,27)(14,17,25,28,22,16,21,23)(1,2,3,4)(7,12)(9,10)(13,16,19,17)(14,20,22,27)(15,25,26,21)(18,28,24,23)(5,7)(6,10)(8,12)(9,11)(13,17,19,16)(14,20,22,27)(15,25,26,21)(18,23,24,28)(7,12)(9,10)(15,26)(16,17)(20,27)(23,28) 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.