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