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