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