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