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