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