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