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