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