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