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