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