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