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