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