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