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