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