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