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