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