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