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