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