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