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